Hi and welcome.
Excellent info above.
"Do I need to be prepared in any way? Will I have to talk?"
I found the only preparation I finally needed was being honest with myself about my drinking and part of that was for me was accepting that I can not drink in safety.
You may just want to give your first name and if you want to say I'm an alcoholic. Some people plan to say nothing and that's OK, then at the last minute say a few words.
It would benefit you if you could say that your new.
You'll get much benefit from listening and identifying.
BE WELL